1. OPTICAL PROPERTIES AND MICROSTRUCTURAL CHANGES OF HARD DENTAL TISSUES IN GASTRO-ESOPHAGEAL REFLUX DISEASE PATIENTS. Authors: RADU CHISNOIU, MARIOARA MOLDOVAN, MIHAELA PĂSTRAV, OVIDIU PĂSTRAV, MONICA LAURA DASCĂLU (RUSU), ANDREA MARIA CHISNOIU, OLGA HILDA ORASAN.